Chemical Formulae, Equations and Calculations Part 1

2 marks · Normal

Write the balanced chemical equation, with state symbols, for the reaction of calcium carbonate with dilute nitric acid to form calcium nitrate, carbon dioxide, and water.

Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.

Show answer

CaCO3(s) + 2HNO3(aq) → Ca(NO3)2(aq) + CO2(g) + H2O(l)

Must show: all state symbols correct; correct reactants/products; balanced equation

Also accept: 2HNO3(aq) + CaCO3(s) → Ca(NO3)2(aq) + CO2(g) + H2O(l)

Common mistakes: missing state symbols; incorrect balancing

Show mark scheme and worked solution

Marking points

M1 · 1 mark · Correct balanced chemical equation (all formulae and numbers; no errors)

M2 · 1 mark · All state symbols present and correct (s, aq, g, l)

Worked solution

The reactants are calcium carbonate (solid) and nitric acid (aqueous). The products are calcium nitrate (aqueous), carbon dioxide (gas), and water (liquid).